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Livermore
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Quanterix Corp

QTRX
Exchange
Nasdaq
Industry
Laboratory Analytical Instruments
SEC CIK
0001503274

In the last 90 days, Quanterix Corp insiders filed 1 open-market purchase and 0 sales; 132 institutions reported holding it in 13F filings for Q2 2026, worth $127.1M in total; no superinvestor holds it.

Holders of 5% or more of QTRX

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Quanterix Corp, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of QTRX
HolderLatest formStakeChangeFirst filedLatest filingFiling
Ameriprise Financial Inc13G/A7.50%3.54M shares+5.40 ppfrom 2.10%Feb 14, 20257 filingsMay 15, 2026SEC
BlackRock, Inc.13G/A7.30%2.84M shares–Jul 17, 20251 filingJul 17, 2025SEC
First Eagle Investment Management, LLC13G5.80%2.75M sharesNewAug 6, 20261 filingAug 6, 2026SEC
Telegraph Hill Partners III, L.P.13G5.40%2.50M sharesNewNov 19, 20251 filingNov 19, 2025SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

47 Schedule 13D and 13G filings on Quanterix Corp, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on QTRX
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 14, 20263:10 PM ETPortolan Capital Management, LLCand 1 other13G/A4.02%1.90M shares−2.23 ppfrom 6.25%Below 5%Jun 30, 2026SEC
Aug 6, 202610:38 AM ETFirst Eagle Investment Management, LLCand 1 other13G5.80%2.75M sharesNewJun 30, 2026SEC
May 15, 20264:06 PM ETPortolan Capital Management, LLCand 1 other13G/A6.25%2.95M shares−3.11 ppfrom 9.36%Mar 31, 2026SEC
May 15, 202610:36 AM ETAmeriprise Financial Inc13G/A7.50%3.54M shares+5.40 ppfrom 2.10%Mar 31, 2026SEC
May 7, 202610:19 AM ETAmeriprise Financial Inc13G/A2.10%990.2K shares−8.60 ppfrom 10.70%Below 5%Apr 30, 2026SEC
Mar 27, 202611:35 AM ETVanguard Group Inc13G/A0.00%0 shares−6.51 ppfrom 6.51%Below 5%Mar 13, 2026SEC
Feb 17, 20269:53 AM ETAmeriprise Financial Incand 8 others13G/A10.70%5.00M shares+1.60 ppfrom 9.10%Dec 31, 2025SEC
Nov 19, 20254:00 PM ETTelegraph Hill Partners III, L.P.and 3 others13G5.40%2.50M sharesNewSep 30, 2025SEC
Nov 14, 202510:07 AM ETAmeriprise Financial Incand 7 others13G/A9.10%4.24M shares−0.50 ppfrom 9.60%Sep 30, 2025SEC
Aug 13, 20254:10 PM ETPortolan Capital Management, LLCand 1 other13G/A9.36%3.63M shares+1.72 ppfrom 7.64%Jun 30, 2025SEC
Jul 17, 20257:54 PM ETBlackRock, Inc.13G/A7.30%2.84M shares–Jun 30, 2025SEC
Jul 15, 20255:15 PM ETKent Lake PR LLCand 5 others13D/A4.50%2.09M shares−2.40 ppfrom 6.90%Below 5%Jul 11, 2025SEC
May 15, 202511:30 AM ETAmeriprise Financial Incand 7 others13G/A9.60%3.72M shares−1.10 ppfrom 10.70%Mar 31, 2025SEC
May 15, 202511:29 AM ETPortolan Capital Management, LLCand 1 other13G/A7.64%2.96M shares–Mar 31, 2025SEC
May 14, 20255:10 PM ETAlliancebernstein L.P.13G/A0.10%37.0K shares−6.20 ppfrom 6.30%Below 5%Mar 31, 2025SEC
May 7, 202510:44 AM ETAmeriprise Financial Incand 7 others13G/A10.70%4.16M shares+2.40 ppfrom 8.30%Apr 30, 2025SEC
Apr 30, 20255:12 PM ETAkoya Biosciences, Inc.13D/A0.00%0 shares−6.20 ppfrom 6.20%Below 5%Jan 9, 2025SEC
Apr 30, 202511:13 AM ETVanguard Group Inc13G/A6.51%2.53M shares–Mar 31, 2025SEC
Apr 23, 20254:05 PM ETMillennium Management LLCand 3 others13G/A0.10%55.7K shares–Below 5%Mar 31, 2025SEC
Mar 3, 20255:00 PM ETKent Lake PR LLCand 5 others13D/A6.90%2.65M shares+0.99 ppfrom 5.91%Feb 28, 2025SEC
Feb 14, 202511:54 AM ETAmeriprise Financial Incand 7 others13G8.30%3.21M sharesNewDec 31, 2024SEC
Feb 13, 20251:45 PM ETKent Lake PR LLCand 2 others13D5.91%2.28M sharesNewFeb 7, 2025SEC
Feb 5, 20254:31 PM ETAlliancebernstein L.P.13G/A6.30%2.44M shares−2.20 ppfrom 8.50%Dec 31, 2024SEC
Jan 16, 20259:29 PM ETAkoya Biosciences, Inc.13D6.20%2.96M sharesNewJan 9, 2025SEC
Nov 15, 20241:37 PM ETAlliancebernstein L.P.13G8.50%3.27M sharesNewSep 30, 2024SEC
Feb 14, 2024Camber Capital Management LP13G/AOld format–––SEC
Feb 14, 2024Pura Vida Investments, LLC13G/AOld format–––SEC
Feb 14, 2024Pura Vida Investments, LLC13G/AOld format–––SEC
Feb 13, 2024Vanguard Group Inc13GOld format–New–SEC
Jan 29, 2024Millennium Management LLC13G/AOld format–––SEC
Sep 29, 2023Millennium Management LLC13GOld format–New–SEC
Feb 23, 2023Pura Vida Investments, LLC13G/AOld format–––SEC
Feb 14, 2023Camber Capital Management LP13G/AOld format–––SEC
Feb 14, 2023Macquarie Group Ltd13G/AOld format–––SEC
Feb 14, 2023Gilder Gagnon Howe & Co LLC13G/AOld format–––SEC
Jan 31, 20231:58 PM ETBlackRock Inc.13G/AOld format–––SEC
Jan 25, 2023Pura Vida Investments, LLC13G/AOld format–––SEC
Aug 19, 2022Camber Capital Management LP13GOld format–New–SEC
Feb 14, 2022Gilder Gagnon Howe & Co LLC13G/AOld format–––SEC
Feb 11, 2022Macquarie Group Ltd13GOld format–New–SEC
Feb 4, 20224:12 PM ETBlackRock Inc.13GOld format–––SEC
Mar 9, 20216:33 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 16, 2021Bain Capital Venture Fund 2005, L.P.13G/AOld format–––SEC
Feb 16, 2021Gilder Gagnon Howe & Co LLC13G/AOld format–––SEC
Feb 16, 2021Price T Rowe Associates Inc13G/AOld format–––SEC
Feb 2, 20213:13 PM ETBlackRock Inc.13GOld format–New–SEC
Feb 2, 2021Arch Venture Fund VI LP13G/AOld format–––SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Quanterix Corp shares.

No Form 144 notices for Quanterix Corp are on file.